5649921 has 12 divisors (see below), whose sum is σ = 8238672. Its totient is φ = 3730776.

The previous prime is 5649913. The next prime is 5649949. The reversal of 5649921 is 1299465.

5649921 = T₂₇₀ + T₂₇₁ + ... + T₃₇₆.

5649921 is a `hidden beast` number, since 5 + 649 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 5649921 - 2³ = 5649913 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5649901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1971 + ... + 3896.

It is an arithmetic number, because the mean of its divisors is an integer number (686556).

Almost surely, 2^5649921 is an apocalyptic number.

It is an amenable number.

5649921 is a deficient number, since it is larger than the sum of its proper divisors (2588751).

5649921 is a wasteful number, since it uses less digits than its factorization.

5649921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5980 (or 5977 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 5649921 is about 2376.9562469680. The cubic root of 5649921 is about 178.1069193097.

The spelling of 5649921 in words is "five million, six hundred forty-nine thousand, nine hundred twenty-one".